form{
    width: 400px;
    height: 400px;
    position: absolute;
    top:0px;
    left: 0px;
    right: 0px;
    bottom:0px;
    margin: auto;
    background-color: #ccc;
    box-shadow: 0 0 15px red;
}

form p{
    height: 66px;
    margin: 10px;
} 
form p label{
    display: inline-block;
    font-size: 18px;
    width: 60px;
    height: 30px;
    margin: 0px;
    text-align: center
}
form p input{
    width: 220px;
    height: 30px;
    margin-top: 20px;
    border: 1px solid rgb(170, 170, 155);
}
form p:nth-of-type(1) input,p:nth-of-type(2) input ,p:nth-of-type(3) input{
    width: 300px;
}
form p #cpa {
    display: inline-block;
    padding: 5px;
    background-color: skyblue;
    border-radius: 10%;
    text-align: center;
}

#btn {
    width:100px;
    height: 40px;
    margin: auto;
    margin: 0px 150px;
    background-color: skyblue;
    border-radius: 20%;
    line-height: 40px;
    text-align: center;
}